Relieving attachment for lathes.



P. PLANTINGA.

RELIEVING ATTACHMENT FOR LATHES.

APPLICATION FILED IAN.24, I912.

Patentedl Jan. M, 1919.

3 SHEETS-SHEET 1- ATTORNEYS mmulmnnn IIIIIIIIIIIIIIIIIIIIIII P. PLANTING/k.

RELIEVING ATTACHMENT FOR 'LATHES. APPLICM'ION FILED JAN-24. 1911.

LQQ TL l 1 Patented Jan. 14, 1919.

3 SHEETS-SHEET 2- P. PLANTINGA. HELIEVING ATTACHMENT FOR LATHES.

APPLICATION FILED JANTZQT 191T- Patented Jan. 14, 1919 3 SHEETS-SHEEY 3.

IN VEN TOR.

WITNESSES:

All)

STATES PATENT OFFICE.

PETER. JPLANTINGA, OF ROCHESTER, NEW YORK, ASSIGNOR TO DAVIS MACHINE TOOL 60., ING, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

RELIEVING ATTACHMENT FOR LATHES.

Specification of Letters Patent.

Patented J an. 14, 1919.

Application filed January 2 1, 1917. Serial No. 144,274

To all whom it may concern:

Be it known that I, PETER PLANTINGA, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Relieving Attachments for Lathes; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference characters marked thereon.

My invention relates to relieving attachments for lathes 0f the type described in my co-pending application, Serial No. 106,302 filed June 28, 1916, and has for its object to provide improved means for relieving taps, dies, reamers, milling cutters, etc., the device being applicable both to interior as well as exterior relieving. A further object of the invention is to provide a tool carrying slide operatively connected with and controlled by mechanism which may be quickly adjusted to change the length of the stroke of the slide for the purpose of varying the depth of out upon the work piece from time to time. To these and other ends the invention consists in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a side elevation of a machine embodying one form of the invention;

Fig. 2 is a sectional elevation taken on line aa of Fig. 1;

Fig. 3 is a sectional plan taken on line bb of Fig. 2;

Fig. A is an end elevation of the machine, and

Fig. 5 is a similar view with parts broken away and showing parts in different positions.

Similar reference characters throughout the several views indicate the same parts.

in the construction of a machine of the present type I have provided a tool holding slide operatively connected with a universal telescopic shaft arranged to be rocked by a cam controlled lever, the throw of which is readily changed by the shifting of a slide bolt arranged to contact at various points with a pivoted member interposed between the operating cam and the lever for actuatmg the telescopic shaft. Means is also provided for preventing the striking of the cam by the cam shoe upon the movement of the latter from the high point of one of the cam surfaces to the low point of another. The mechanism controlling the render the shaft inoperative upon rotation of the cam shaft in a backward direction.

Referring to the drawings by numerals 10 represents the frame'or bed of the machine upon which is mounted a spindle 11 supported in bearings 12 and provided with a cone pulley 13. A work piece 14 in the form of a tap is carried by a mandrel 15, the opposits ends of which are supported at 16 and 17. Rotation of the work piece is effected by the rotation of the face plate 18 on the spindle 11. A carriage 19 is reciprocally mounted longitudinally of the machine upon guides 20 and may be operated at diderent speeds by means of a system of change gears suitably connected with the carriage. The carriage may also be reciprocated by hand through the medium of the handle 21 on a shaft 22 journaled in an apron 23 and carrymg a pinion in engagement with a rack (not shown) the rack being mounted on the bed 10 behind the apron. A transverse slide 24 is mounted upon the carriage 19 and is arranged to be reciprocated by means of a feed screw connected with the slide and operated by a handle 25. Upon the slide 24 is rota tably mounted a table 26 carrying a recipro catory tool holding slide 27 adapted to receive any suitable tool holding member such as the tool post 28 carrying the tool 29 adapted to operate upon the work piece 14 in a manner which will presently be described. The slide 27 is arranged to be reciprocated both automatically and by hand and in the case of the latter by means of a feed screw on a shaft 30 operated by a tool slide operating shaft is so arranged as to cam controlled shaft 35 by means of a universal joint 36 as shown in Fig. 1. The shaft 35 extends through a casing 37 and is journaled in bearings 38 and 39 upon opposite sides of the casing. A short cam shaft 40 is also extended through the casing and is seated in bearings upon the opposite sides thereof and provided with a pinion 41 connected with one of a series of change gears 42 on an adjustable arm 43 which is carried by the cam shaft 40, the arm having a slotted segment 44 arranged to be clamped in any desired position by a stud bolt 45. The gear 42 is driven by a pinion 46 operatively connected with a gear 46driven by a pinion 47 in mesh with a gear 48 on the lathe spindle as shown in Fig. 1. Within the casing 37 and upon the shaft 40 is keyed a cam member 49 having a plurality of lobes 50 in the path of a projection or wiper 51 on a shoe 51 pivoted at upon an arm 53, the latter being pivotally mounted at 54 upon a lug 55 projecting upwardly from the bottom wall 56 of the casing 37. The shoe 51' is free to move in an upward direction from the position shown in Fig. 2, but is prevented from further downward movement by the shoulder 57 in contact with the face of the arm 53 adjacent the cam member 49. A spring 58 having one end seated in a lug 59 on the casing and the other end in the shoe 51 serves to normally holdsaid shoe in the position shown in Fig. 2, so that rotation of the cams 50 in the direction indicated by the arrow will serve to actuate the arm 53 outwardly while rotation of the cams in a reverse direction will move the shoe upon its pivot and prevent operation of said arm. Keyed upon the shaft 35 within the casing 37 is a downwardly extending lever 60 which is slotted at 61 to receive the horizontally positioned sliding bolt 62, the inner end of which is beveled at 63 to engage the back of the pivoted arm 53, the bolt being adjustable within the slot 61 to engage said arm at various points thereon, whereby a very fine adjustment of the throw of the shaft 35 may be effected to control the movement of the tool slide and tool thereon operating upon the work piece. The adjustable bolt 62 is threaded at 64 to receive a clamping nut 65 in contact with a washer 66 interposed between the clamping nut and lever 61 opposite the shoulder 67 of the bolt which is seated upon the inner edges of the lever surrounding the slot 61. At one side of the bottom of the lever is a lug 68 upon which is seated one end of a spring 69, the opposite end of which is seated upon the inner end of a thumb screw 70 having threaded engagement with a boss 71 on the casing 37, The thumb screw serves as a means for regn lating the tension of the spring 69 which is provided for the purpose of moving the lever in the direction of the cam member when the shoulders 72 of the cams are carried past the shoe. In order to prevent the. shoe from striking the cams at the base of the shoulders upon inward movement of the lever 60 by thespring 69 I provide upon the bottom of the lever an adjustable screw 73 the inner end of which is arranged to strike the end of a plug 74 seated in the wall 56 and preferably formed of fiber or other suitable material. The screw 73 is so adjusted that when it strikes the plug 74 the wearing surface of the shoe moving inwardly will be arrested before it comes in contact with the next succeeding cam. However. i-ontinned rotation of the cam member in the direction indicated by the arrow will quickly bring said cams in contact with the shoe, whereby outward movement of the arm 5?) is effected to actuate the lever 60 and tool slide 27 in the direction of the work piece through the medium of the universal shaft 33.

It will be understood that the change in the throw of the lever 60 to imzrease or reduce the reciprocating movement of the tool slide 27 is readily effected by the up and down movement of the slide bolt 62 and that the nearer the bolt is positioned to the top of the arm 53 the greater the movement of the lever and consequently the deeper will be the out effected by the tool upon the work piece. Each new position of adjustment of the sliding bolt will require a new adjustment of the stop screw 73 to prevent the cam shoe from striking the cams at the base of the shoulders 7 2.

I claim as my invention 1. A lathe comprising in combination a movable work holding member, a slide, ashaft operatively connected therewith, a lever connected with said shaft, a cam, means for rotating the cam, a. pivoted member in the path of the cam arranged to be-actuated thereby and a slidable member upon the lever movable to various points of contact with said pivotal member for the purpose of changing the throw of said lever.

2. In a lathe, the combination with a movable work holding member, a slide, a shaft operatively connected therewith, a lever on the shaft, a cam for reciprocating the lever, and means for varying the extent of movement of the lever comprising a pivoted arm, and a member slidable on the lever in contact with the arm.

3. A lathe comprising in combination a work holding member, a tool slide, a shaft operatively connected therewith, a cam, means for operating the same, a pivotal arm in the path of the cam, means operatively connected with the shaft arranged to be actuated by said arm for effecting movement of the shaft in one direction, means for moving the arm in the direction of the cam and lit) an adjustable stop for limiting the move ment of said arm in the last mentioned direction. v

4c. A lathe comprising in combination a work holding member, a tool slide, a shaft operatively connected therewith, a cam, means for operating the cam in opposite directions, a movable arm, a pivoted shoe upon the arm in the path of the cam, said shoe being movable upon its pivot in one direction only and means operatively connected with the shaft arranged to be actuated by said arm.

5. ln a lathe, the combination of a work holding member, a tool holding slide, a shaft for moving said slide, a rotatable cam, an arm on the shaft, means independent of the arm interposed between it and the cam for transmitting motion from the cam to the arm, and means for controlling the extent of movement of the arm.

6. A lathe comprising in combination a work holding member, a tool slide, a shaft operatively connected therewith, a lever connected with said shaft, a pivoted arm adjacent the lever, an adjustable member upon the lever movable to engage said arm at dif ferent points thereon, a second shaft, means for operating the same, a cam having a plurality of lobes mounted upon said second shaft arranged to effect movement of the arm and lever in one direction and means for effecting movement of said arm and lever in an opposite direction.

7. A lathe comprising in combination a work holding member, a shaft operatively connected therewith, a lever connected with the shaft, a pivoted arm arranged to actuate said lever in one direction, a spring for actuating the arm and lever in an opposite direction, a shoe upon the arm, a rotatable member having a series of cam lobes movable in the path of the shoe, means for rotating the same and a stop for preventing the shoe from striking said lobes when moving from one to the other upon movement of the arm by said sprin 8. In a lathe, the combmation with a movable work holding member, a tool holding slide, a shaft operatively connected with said slide, a lever on said shaft, an arm pivoted in substantially parallel relation with said lever, means for reciprocating said arm, and means on said lever in the path of said arm adjustable to and from the axis of the lever to vary the extent of throw imparted thereto.

9, In a lathe, the combination of a work holding member, a tool holding slide, a shaft for moving said slide, an arm on the shaft, a rotatable cam, a pivoted device in the path of the cam adapted to be reciprocated thereby and operatively engaging the arm, and means for varying the throw of the arm.

10. In a lathe, the combination of a work holding member, a tool holding slide, a shaft for moving said slide, an arm on the shaft, a pivoted device operatively engaging said arm, a rotatable cam having a plurality of shoulders, and a wiper movably mounted on said pivoted device in engagement with said cam and adapted to move the pivoted device when the cam is turned in one direction, but to move thereon out of the path of the shoulders of the cam when the cam is turned in the reverse direction.

PETER PLANTINGA.

topics of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

